Human influences on ecosystems — IGCSE Science - Combined (0653) questions by topic
Greenhouse gases and strategies to reduce climate-change effects are the focus here: completing a sentence about increased greenhouse effect, evaluating strategies such as reducing livestock farming, and suggesting why cement production from calcium carbonate raises environmental concern. Suggest, explain and complete lead the command words, and suggest wants a specific consequence linked to the named process, not a general environmental comment.
Only 5 real questions currently sit in this set, drawn from 2024 to 2025 papers and worth 1 to 10 marks, so each question targets a distinct climate-change idea rather than repeating one. Practising with instant marking is well suited here, since it checks whether a suggested strategy is linked correctly to its explanation rather than paired with a plausible-sounding but incorrect one.
May–June 2025, Paper 21
Which row shows the effect of deforestation on oxygen and carbon dioxide concentrations in the atmosphere? oxygen concentration carbon dioxide concentration --- --- --- A…
Answer this question and get it marked →Which row correctly explains a strategy to reduce the effects of climate change? strategy explanation --- --- --- A plant more trees trees use up land for growing crops B reduce…
Answer this question and get it marked →May–June 2025, Paper 23
Which graph explains why scientists are concerned about climate change? Each option plots concentration of carbon dioxide in the atmosphere (vertical axis) against year…
Answer this question and get it marked →May–June 2025, Paper 42
Calcium oxide, CaO, is used to make cement. Calcium oxide is formed by the decomposition of calcium carbonate, CaCO3, at a very high temperature. The equation for the reaction is…
Answer this question and get it marked →October–November 2024, Paper 41
Carbon dioxide is a greenhouse gas. (a) Complete the sentence about greenhouse gases in the Earth's atmosphere. Increased concentrations of greenhouse gases cause an ............…
Answer this question and get it marked →Other IGCSE Science - Combined topics
- Practical skills (96)
- Motion, forces and energy (53)
- Electricity and magnetism (38)
- Waves (32)
- Human nutrition (23)
- Acids, bases and salts (22)
- Organisms and their environment (21)
- Organic chemistry (21)
- Reproduction (20)
- Thermal physics (20)
- Plant nutrition (19)
- The Periodic Table (18)